Serial digital bit stream code detector

Details Serial digital bit stream code detector Serial digital bit stream code detector

H - Electricity

03

K

354/241, 328/82

H03K 5/19 (2006.01) G05B 19/05 (2006.01) H03M 13/51 (2006.01) H04J 3/12 (2006.01) H04Q 1/39 (2006.01) H04Q 1/457 (2006.01) H04Q 3/545 (2006.01) H04Q 11/04 (2006.01)

Patent

CA 1041671

ABSTRACT OF THE DISCLOSURE A code detector for detecting the presence or absence of one or more particular binary digital signalling codes in the digital bit stream from extension telephones of a digital private automatic branch exchange (PABX) telephone system. The detector is connected to a telephone being monitored and receives digital data from the telephone, which data may be random speech data or a signalling code. The detector consists essentially of a read only memory (ROM) which uses each of the data bits arriving in serial form as the least significant bits of the address for a micro-program stored in the ROM which provides the other address bits, thus causing the program to be stepped through a sequence of addresses which depend upon the sequence of the incoming data bits. For a program to end up at a specified address the ROM must receive the code which is unique in causing the program to arrive at that address. The detector then outputs a code representative of the detected code.

185556

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